How can I "stretch" or "compress" a 4-20mA signal from a temperature controller?

I am controlling a VSD with a 4-20mA signal from a temperature controller which converts the temperature it measures into a mA signal. My problem is that I am only interested a small part of the range available (range: -200 to +600deg, using 10-100deg) and so am only receiving about 6-8mA at my VSD which leaves me... show more I am controlling a VSD with a 4-20mA signal from a temperature controller which converts the temperature it measures into a mA signal. My problem is that I am only interested a small part of the range available (range: -200 to +600deg, using 10-100deg) and so am only receiving about 6-8mA at my VSD which leaves me with very little to control my output Hz, how can I change these 6-8mA into a new 4-20mA signal?
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